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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Clay minerals related to the circulation of geothermal fluids in boreholes at Rittershoffen (Alsace, France)
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Clay minerals related to the circulation of geothermal fluids in boreholes at Rittershoffen (Alsace, France)

机译：与Rittershoffen（法国阿尔萨斯）钻孔中的地热流体循环有关的粘土矿物

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Two geothermal wells, GRT-1 and GRT-2, were drilled into the granite at Rittershoffen (Alsace, France) in the Upper Rhine Graben to exploit geothermal resources at the sediment-basement interface. Brine circulation occurs in a permeable fracture network and leads to hydrothermal alteration of the host rocks. The goal of the study was to characterize the petrography and mineralogy of the altered rocks with respect to the permeable fracture zones in the granitic basement. As clay minerals are highly reactive to hydrothermal alteration, they can be used as indicators of present-day and paleo-circulation systems. Special attention has been paid to the textural, structural and chemical properties of these minerals. The fine-grained clay fraction (<5 mu m) was analyzed around the originally permeable fracture zones to observe the crystal structure of clay minerals using X-ray diffraction. Chemical microanalysis of the clay minerals was performed using scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. The occurrences of mixed layers illite-smectite (-10% smectite) provide a promising guide for identifying the fracture zones that control the present-day circulation of geothermal fluids in the Rittershoffen wells. However, multistage paleo-circulation systems could lead to an abundance of heterogeneous and fine-grained illitic minerals that could plug the fracture system. The permeability of fracture zones in the GRT-1 well was likely reduced because of an intense illitization, and the well was stimulated. The occurrence of chlorite in the permeable fracture zones of GRT-2 is indicative of less intense illitization, and the natural permeability is much higher in GRT-2 than in GRT-1. (C) 2017 The Authors. Published by Elsevier B.V.
机译：在上莱茵河格拉本的Rittershoffen（法国阿尔萨斯）的花岗岩中钻了两个地热井GRT-1和GRT-2，以在沉积物-基底界面处开采地热资源。盐水循环发生在渗透性裂缝网络中，并导致主体岩石发生热液蚀变。该研究的目的是相对于花岗岩基底中的渗透性断裂带表征蚀变岩石的岩石学和矿物学。由于粘土矿物对水热蚀变反应性高，因此它们可用作当今和古循环系统的指标。这些矿物的结构，结构和化学性质已得到特别关注。在最初可渗透的裂缝区域周围分析了细颗粒的粘土级分（<5微米），以使用X射线衍射观察粘土矿物的晶体结构。使用扫描电子显微镜结合能量色散X射线光谱法对粘土矿物进行化学微分析。伊利石-蒙脱石（-10％蒙脱石）混合层的出现为确定控制Rittershoffen井当今地热流体循环的裂缝带提供了有希望的指导。但是，多级古循环系统可能导致大量不均匀和细粒的硅质矿物，可能会堵塞裂缝系统。由于强烈的非法化作用，GRT-1井中裂缝带的渗透率可能会降低，因此该井受到了增产。在GRT-2的渗透性断裂带中发生亚氯酸盐，表明未发生强烈的未饱和作用，并且GRT-2的自然渗透率远高于GRT-1。 （C）2017作者。由Elsevier B.V.发布

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